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首页> 外文会议>Conference on Integrated Optics: Devices, Materials, and Technologies Ⅵ Jan 21-23, 2002 San Jose, USA >F_2-Laser Photosensitivity Applications in Germanosilicate Fiber and Planar Waveguides
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F_2-Laser Photosensitivity Applications in Germanosilicate Fiber and Planar Waveguides

机译：F_2-激光光敏性在锗硅酸盐纤维和平面波导中的应用

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摘要

The energetic 7.9-eV photons of the F_2 laser directly access bandgap states in germanosilicate glasses to provide a strong and direct channel for inducing refractive index changes in optical fibers and planar waveguides. In this paper, we review our F_2-laser photosensitivity studies with an aim to assess prospects for shaping useful photonics structures directly inside the germanosilicate waveguides. We describe strong photosensitivity responses in standard telecommunication fibers and planar optical waveguides without the need for hydrogen loading, and compare with responses provided by traditional ultraviolet lasers. Because of the strong 157-nm absorption in the germanium-doped guiding layers, large non-uniform changes to refractive index are noted that offer opportunities for trimming phase errors and correcting waveguide birefringence in planar optical circuits. With hydrogen soaking, modest 157-nm pre-irradiation was found to 'lock-in' a permanent photosensitivity enhancement in the germanosilicate guiding core, permitting the formation of strong (40-dB) and stable fiber Bragg gratings with 248-nm KrF laser light. The 157-nm 'lock-in' mechanism is associated with Si-OH and Ge-OH defect formation and permanently enhances the ultraviolet photosensitivity response by several orders of magnitude above that for an untreated fiber without the aging related disadvantages of conventional hydrogen soaking. The unique opportunities for F_2-laser photosensitivity applications in shaping and trimming photonic components will be outh'ned in this presentation.
机译：F_2激光的高能7.9 eV光子直接进入锗硅酸盐玻璃中的带隙态，从而为诱导光纤和平面波导中的折射率变化提供了强大而直接的通道。在本文中，我们回顾了我们的F_2激光光敏性研究，目的是评估直接在锗硅酸盐波导内部塑造有用的光子结构的前景。我们描述了标准电信光纤和平面光波导中不需要氢负载的强光敏性响应，并与传统紫外激光器提供的响应进行了比较。由于在掺锗的导向层中吸收了157 nm的强光，因此人们注意到折射率发生了很大的不均匀变化，这为微调相位误差和校正平面光学电路中的波导双折射提供了机会。通过浸氢，适度的157 nm预辐射可以“锁定”锗硅酸盐导向芯中的永久光敏性增强，从而可以通过248 nm KrF激光形成坚固的（40 dB）稳定的光纤布拉格光栅光。 157 nm的“锁定”机制与Si-OH和Ge-OH缺陷的形成有关，并永久地将紫外线光敏性响应提高了几倍，比未经处理的光纤高出几个数量级，而没有传统的氢吸收带来的老化相关缺点。在本演讲中，将介绍F_2激光光敏技术在整形和修整光子组件中的独特机会。

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